Apparatus for spraying glass, etc.



Dec. 8, 1931. J. H. JUERS 1,835,402

APPARATUS .FOR SPRAYING GLASS, ETC

Filed Jan. 21, 1930 5 Sheets-Sheet l Dec. 8, 1931. JUERS 1,835,402

APPARATUS FOR SPRAYING GLASS, ,ETC

Filed Jan. 21, 1930 5 Sheets-Sheet 2 Dec. 8, 1931. J, JUERS 1,835,402

- APPARATUS FOR SPRAYING GLASS, ETC

Filed Jan. 21, 1930 5 Sheets- Sheet s @wvawtoz Dec. 8, 1931. J. H. JUERS APPARATUS FOR SPRAYING GLASS, ETC

Filed Jan. 21, 1930 5 Sheets-Sheet 4 Dec. 8, 1931. J JUERS 1,835,402

APPARATUS FOR SPRAYING GLASS, 'ETC Filed Janv 21, 1930 5 Sheets-Sheet 5 Patented Dec. 8, 1931 UNITED STATES PATENT OFFICE JOHN HENRY J'UERS, OF PASSAIC, NEW JERSEY, ASSIGNOR TO TRIPLEX SAFETY GLASS COMPANY OF NORTH AMERICA, OI NEW YORK, N. Y., A CORPORATION OF DELA- WARE APPARATUS FOR SPRAYIN'G GLASS, ETC.

Application filed. January 21, 1930. Serial No. 422,283.

This invention has been developed with particular reference to the manufacture of laminated glass in which the proximate surfaces of the two sheets of glass, before they are laid up with the interposed sheet of celluloid, receive a film of gelatine or the l ke for the purpose of promoting the adhesion of the celluloid and glass. It will nevertheless be understood that the invention is capable of ap lication in other arts wherever 1t 1s desira le to apply a film of uniform thlckness, although in the manufacture of laminated glass it is particularly important that the film shall be of the same thickness at every point of the surface to which it is applled. The film, whatever its ultimate purpose, s applied in liquid form by means of what 1s known in the art as a spray gun, by wh1ch the liquid is projected in the form of a cone. The

lass or other thing to be coated is supported Ey a conveyor and moves at a uniform rate. The spray gun, supplied from-any su table source with the liquid to be sprayed, 1s reciprocated transversely with respect to the line of movement of the conveyor and deposits the film upon the material carried by the conveyor. It will be apparent that if both the conveyor and the spray gun were statlonary and the spray was stopped for a brief moment thefilm would be deposited in the form of a cone with a diameter equal to the diameter of the spray cone determined by the distance between the orifice of the spra gun and the glass and with an altitude whic would be slight but would nevertheless cause a variation in the thickness of the film increasing from the perimeter to the center of the cone. Heretofore, in apparatus designed for the spraying of glass, in the manufacture of laminated glass, the spray gun has been reciprocated in a fixed line, while the glass moves forward at a uniform rate, with the result that the axis of the spray cone describes on the glass a zigzag line which is slightly 7 the conve or, of the glass, or other material supporte thereby and of the spray un, are synchronized in such manner that for each full transverse stroke of the spray gun in one direction the conveyor advances a distance equal to the radius R of such cone, successive points of the zigzag path on the center line will be separated by the distance R and as the successive cones formed by the spray gun overlap and are separated by the distance R, the film deposited will be of uniform thickness equal to H all along such center line. It will be obvious, however, that except along the center line, that is, the median line of the reciprocation of the spray gun, the film deposited will not be of uniform thickness for the cones will be separated, as to their centers, by unequal distances which for convenience may be designated as M and N, respectively, and there will be produced a film which has a thickness greater than H in some places and less than H in other places.

It is the object of the present invention to prevent such lack of uniformity in thickness of the film deposited and to secure as nearly as possible absolute uniformity of thickness of the film at all points of the reciprocations of the axis of the spray gun. This is accomplished, as will be described more particularly hereinafter, by causing the spray gun to move in a path which is not at right angles to the line of movement of the conveyor but is at an angle with respect to a line perpendicular to the line of movement of the conveyor and when it reaches the end of its movement to move rearwardly through a distance equal to the distance R and then take up its return reciprocation on a line similarly but oppo sitely inclined with respect to such line at right angles to the line of movement of the conveyor and, when it reaches the end of its return reciprocation, to move rearwardly again through a distance equal to the distance R to a point from which it begins again its forward reciprocation. In this manner the axis of the spray cone describes on the moving surface upon which the spray is directed a series of lines which are vparallel and are separated by the distance R, with the result that the film deposited is practically uniform in thickness for all points on the surface of the conveyor or of the lass or whatever else may be carried there y. A suitable means for effectin such movement of the spray gun has been chosen for illustration of the nature of the invention and will be particularly described hereinafter with reference to the accompanying drawings in which:

Figure 1 is a diagrammatic representation of a path described by the axis of a spray gun when it is reciprocated in a path at right angles to the line of movement of the surface to be sprayed, the latter being represented by rectangles which may be taken to be sheets of glass placed side by side upon a conveyor.

Figure 2 is also a diagrammatic view illustrating different positions of a spray gun and of the spray cone formed thereby with reference to the surface sprayed.

Figure 3 is a diagrammatic view representing particularly the formation of a cone of film at any one position of the spray gun.

Figure 4 is a diagrammatic view representing the relations of a successive series of cones forming a film of uniform thickness.

Figure 5 is a view similar to Figure 4, but showing the relations of cones formed when the spray gun reciprocates in a path at right angles to the line of movement of the conveyor.

Figure 6 is a diagrammatic representation of the path of movement of the axis of the spray cone when the movement of the spray gun is effected in accordance with the present invention.

Figure 7 is a view in front elevation of so much of a spray apparatus as is necessary to enable the application of the invent-ion to be understood.

Figure 8 is a view of the same in sectional elevgtion as seen from the righthand in Figure Figure 9 is a partial sectional view of the same as seen from above.

Figure 10 is a view in front elevation of some of the parts shown in Figure 9.

Figures 11, 12 and 13 are detail views on a larger scale of some parts of the apparatus, Fi re 13 being a view in section on the plane in icated by the broken line 13-13 of .Figure 11.

In order that the nature of the invention may be more readily explained reference will be had first to the diagrammatic representations shown in Figures 1-6.

Let it be assumed, with reference to Figures 1 and 2 that the surface or surfaces to be sprayed are represented by sheets of glass laid side by side upon a conveyor, sufliciently indicated at m, which moves at uniform rate in the direction indicated by the arrows at A and B, the line AB being also the median line of the apparatus and the median line of the reciprocations of the spray gun indicated at y. The reciprocations of. the spray gun and the forward movement of the conveyor being properly synchronized the axis y of the spray gun and of the spray cone formed thereby will describe on t 1e surface to be sprayed a zigzag line substantially as represented in Figure 1.v At any point in such path the spray will be deposited in a circle which has a radius R. The thickness of the deposit increasing from nothing at the perimeter to a maximum at the center where it has a thickness H. Under the prescribed conditions of synchronization it Will be obvious that the points at which successive reciprocations of the cone axis intersect the median line A-B will be separated from each other by the distance R and that at such points each deposited cone will overlap the next so that along the median line the deposited film will be of uniform thickness H, as represented in Figure 4. On longitudinal lines remote from the median line A-B, such as the line CD of Figure 1, the points of intersection will be separated alternately by distances M and N with the result that the deposited material will attain a thickness greater than H at certain points and less than H at intermediate points, as represented in Figure 5.

It has been assumed above that the spray gun reciprocates in both directions, in a path which is at right angles to the line of movement of the conveyor. If, however, instead of being moved in a path at right angles to the line of movement of the conveyor, the spray gun is moved in a path at an angle determined b the distance R, in such manner, as indicate in Figure 6, that the point where the axis of the spray cone strikes the surface of the conveyor, starting at the righthand point arrives at the point 2, at the end of its lefthand movement and is there moved rearwardly, with reference to the direction of movement of the conveyor, through the distance R, to the point 3, and then moves to the right in a path similarly but oppositely inclined to the point 4, where it is again moved rearwardly, through the distance R, to the point 1, the path of the axis, as described on the moving surface, instead of being the zigzag line of Figure 1, Will be practically a series of parallel lines separated by the distance B, so that at every point in every longitudinal line the deposited cone will overlap the next by the distance R and a film of uniform thickness at every point on the moving surface will be formed.

In the apparatus which has been chosen for illustration of the invention a motor a is shown as connected through a train of gears 11 with a crank shaft a to which is secured a crank arm at having a crank pin a. The latter is 'operatively connected b a link a with a pin b of a cross-head b whic is arranged to slide freely on rods 6 The pin 1) engages a longitudinal slot 0 in a swinging arm a, pivoted at c, and thereby the arm 0 receives a movement of oscillation in a plane transverse to the median km of the apparatus. At its lower end the arm 0 has an extension 0 which moves freely in a guide piece 03 swiveled on a second cross-head d which slides'freely on rods 01 The guide piece 03 receives freely horizontal rods 6 which at their outer ends carr the holder e of the spray un 3 the latter ing provided, as indicated at 3 3 and y, with connections to sources of liquid and air supply as usual in devices of this character.

Since the cross-head d reciprocates in a right line and the arm 0, c swings in an arc and the axis of the spray an is always parallel with the arm c 0 t e spray gun holder e the rods 6 and the guide piece at v must be capable of swiveling with respect to the cross-head 01 Accordingly, the guide piece at is mounted on one end of a spindle d which is received freely in a seat formed therefor in the cross-head al being retained in place by a collar (13 secured fast upon the other end of the spindle d The web (i of the cross-head d is also formed with areshaped slots 03 so that the rods 6, which pass through the slots may have the required swiveling movement. a

At their inner or rearward ends the rods 6 are received in a cross-bar e which has swiveled thereon, as at 6 a yoke e in which is supported a roller e all as shown in Figures 8 and 9 and in detail in Figure 11. A tension spring e, connected at one end to the spray gun holder 6 and at the other end to the g ide piece d, continually urges the spray gun, the holder, the rods 6, the cross-bar e and the roller e to the rear, holding the roller in contact with a track f which is mounted on an axis f to swing in a horizontal plane so that its angular position, with reference to the median line of the apparatus, may be shifted through an angle determined by the radius of the spray cone, as represented diagrammatically in Figure 6. The axis of the spray cone will therefore move in oblique paths, as represented in Figure 6 l The shifting of the angular position of the track f takes placeat the end of each transverse reciprocatory movement of the spray gun and is effected, in the construction shown, by a peripherally grooved cam g which is rotated in synchronism with the movements of the crank arm a, being conveniently mounted on one end of a shaft 9 which is mounted in suitable hearings on the frame and is driven by bevel gears g from a'shaft g which carries a gear g in mesh with a corresponding gear of the train a. The groove 9 of the cam wheel 9, stepped in opposite directions at the opposite ends of a diameter, as at g", is engaged by the roller g of a connecting rod g which is suitably supported and is engaged at its other end with an arm 7" of the track f.

At the end of each transverse reciprocation of the cross-head d the track f therefore has its angular position shifted from one to the other of the two positions of obli uity, indicated by a full line and a broken l1ne in Figure 9, and the path of the s ray gun, which is necessarilyparallel with t e track f, is also shifted in angular position from one to the other of the positions indicated by the full line and the broken line in the dia rammatic Figure 6. In this manner the film cones, such as that represented in Figure 3, deposited bthe spray gun upon the surface to be coate are caused to overlap to an extent measured at every point bythe radius of the circular base of the spray cone not only at the median line of the apparatus, but in the of an inch.

It' will be obvious that various changes in detail of construction and arrangement can be made to suit different conditions of use and the application of the invention to different specific purposes and that, except as pointed out in the accompanying claims, the invention may be realized in differentforms of apparatus and is not restricted to the partlcular construction and arrangement shown and described herein.

I claim as my invention:

1. In a spray apparatus, the combination of a support for the material to be sprayed, a spray gun, movable in a transverse direction and movable also in a longitudinal direction, means to reciprocate the spray gun transversely, a track toward which the spray gun is pressed yieldingly, and means to change the angular position of the track at each reciprocation of the spray gun.

2. In a spray apparatus, the combination of a swinging arm, means to oscillate the arm, a spray gun carried with the arm and movable in a direction at right angles to the planeof oscillation of the arm, a track toward which the spray gun is pressed yieldingly, and means to change the angular position of the track, whereby the angular position of the path of movement of the spray gun is changed in each oscillation.

3. In a spray apparatus, the combination of a spray gun, a movable support for the spray gun, means to reciprocate the support, the spray gun being movable with respect to the support in a direction at right angles to the plane of the reciprocations, a track, means to press the spray gun yieldingly toward the track, and means to change the angular position of the track at each reci rocation, whereby the an lar position of t e path of movement of t e spray-gun is changed in each reciprocation.

4. In a spray apparatus the combination of a spray gun, a.support for the spray gun, means to reciprocate the supplort a spray gun holder, a rod to which the ol er is connected, a tension spring connected to the holder, a pivotally mounted track toward which the rod is pressed by the spring, and means to shift the angular position of the track at each reciprocation, whereby the angular position of the ath of movement of the spray gun is shifte during each reciprocation.

This specification signed this 17th day of January, A. D. 1930.

JOHN HENRY JUERS. 

